Is there a feature to convert Swagger Hub domain object to JSON Schema? or is this a manual process?
And also which version of draft json schema is supported by open api 3.0.0?
OpenAPI 3.0 uses an extended subset of JSON Schema Wright Draft 00 aka Draft 5.
SwaggerHub does not have a way to convert Domains to JSON Schemas. However, third-party OpenAPI-to-JSON Schema converters exist that might be able to do that.